W. L. Yakimoff and others 
43 
Anti-anthrax horse serum continued. 
Number of minutes 
after mixture of 
trypanosomes 
and serum Observations 
28 Rosettes diverging; in some places small groups. 
34 Numerous, separated trypanosomes. 
53 Diverging rosettes still present. 
60 They slowly diverge. 
65 Nearly all have parted. 
85 All have finally separated. 
Serum of horse immune against epidemic abortion. 
1 Trypanosomes immobile. 
2 Some individuals started moving. 
4 Slow agglomeration. 
6 The union effected. 
8 Small rosettes. 
9 Rapid divergence begun. 
10 Many parting. 
13 & 15 Separate individuals. 
35 Immobile separate individuals. 
Serum of horse immune against pig erysipelas. 
Examined during 40 minutes; the trypanosomes did not agglutinate. 
Serum of hull immune against septicaemia. 
1 Trypanosomes slowly unite into small groups. 
2 Small rosettes (3-5 individuals in each). 
3 Rapid divergence. 
6 Separate individuals. 
8 Ditto. 
12-40 Separation. 
42 Final separation. 
Serum of hull immune against chicken cholera. 
1 Trypanosomes active. 
2 Not agglomerated. 
4 Agglomeration per 2-3 individuals; rosettes absent. 
5 Divergence. 
7-28 Separate individual exhibiting lively movements. 
36 All separated. 
VII. INFECTION OF ANIMALS 1 . 
The Turkestan camel trypanosome will infect many species of mammals 
and also some birds. The course of the disease is acute in mice, rats and dogs; 
sub-acute in guinea-pigs, rabbits and horses; and chronic in large cattle and 
sheep. 
1 By W. L. Yakimoff, W. T. Wassilevsky, and N. A. Zwietkoff. 
